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Some blackberry BIS users reported that their service provider wouldn’t let them change the IMAP port number, which meant that couldn’t use the alternate namespace port. To deal with this, I’ve setup a “proxy” server for the IMAP alternate namespace port.

Our “proxy” servers are special hostnames that listen on every port and respond with a particular service. Our current proxy servers are:

imap.proxy.messagingengine.com – IMAP

imaps.proxy.messagingengine.com – IMAP SSL

pop.proxy.messagingengine.com – POP

pops.proxy.messagingengine.com – POP SSL

smtp.proxy.messagingengine.com – SMTP

smtps.proxy.messagingengine.com – SMTP SSL

ldap.proxy.messagingengine.com – LDAP

ldaps.proxy.messagingengine.com – LDAP SSL

imapalt.proxy.messagingengine.com – IMAP (alternate namespace)

imapalts.proxy.messagingengine.com – IMAP (alternate namespace) SSL

So for BIS users, what you would do is:

Login to the BIS website your provider gave you details for

Setup an external email account

When it asks for the username and password, just enter the username and leave the password blank

It should then take you to a page with more advanced configuration options. There you can say to use IMAP + SSL, and when it asks for the servername, use “imapalts.proxy.messagingengine.com”